Solve the enthalpy of formation NH3(g) -46.11

Can someone me with 1 to 4 plz. fast

Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.

If two objects at different te,peraure are in contact with each other what happens to their temperature